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Article Dans Une Revue Radiocarbon Année : 1989

Bomb 14C in the Indian Ocean Measured by Accelerator Mass Spectrometry: Oceanographic Implications

Résumé

AMS 14C measurements on samples collected in the tropical-equatorial Indian Ocean during the INDIGO program (leg II, 1986) are presented and compared with /3counting results obtained under both INDIGO program and GEOSECS expedition in the Indian Ocean (1978). The most significant observation is a doubling of the bomb-14C inventory and mean penetration depth in the equatorial zone. Based on hydrologic considerations, two hypotheses can be proposed: 1) direct influx of Pacific mid-latitude waters through the Indonesian archipelago and 2) advection and/or mixing with Mode Water from the southern gyre of the Indian Ocean. Results obtained with a general circulation model of the ocean suggest that the influx from the Pacific is important in the upper 300m and that below 500m the bomb-14C budget is dominated by Mode Water advection.
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Dates et versions

hal-03551980 , version 1 (02-02-2022)

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Edouard Bard, Maurice Arnold, J R Toggweiler, Pierre Maurice, Jean-Claude Duplessy. Bomb 14C in the Indian Ocean Measured by Accelerator Mass Spectrometry: Oceanographic Implications. Radiocarbon, 1989, 31 (03), pp.510 - 522. ⟨10.1017/s0033822200012108⟩. ⟨hal-03551980⟩

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